Tsushima Current, surface oceanic current, the northeastward-flowing branch of the Kuroshio along the west coast of Japan. Entering the Sea of Japan through the Korea Strait, the Tsushima Current issues the East Korea Warm Current as a northern branch. It is primarily a spring and summer current and is barely discernable in winter.

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...Kuroshio (Japan Current), which corresponds in latitude and general directional flow to the Gulf Stream of the Atlantic, flow northward along Japan’s Pacific coast as far as latitude 35° N. The Tsushima Current branches westward from the Kuroshio off southern Kyushu and washes the coasts of Honshu and Hokkaido along the Sea of Japan; it is this current that lends moisture to the winter...

...Sea circulate in a counterclockwise direction. The southward extension of the Kamchatka Current forms the cold Oya Current, which flows to the east of the Japanese island of Honshu to meet the warm Kuroshio waters in the vicinity of 36° N. The cold, southeast-flowing California Current forms the eastern segment of the returning branch of the North Equatorial Current system.

...circulation of the Kuroshio (Japan Current), the north-flowing western extension of the warm North Equatorial Current. Some of the Kuroshio enters the eastern part of the East China Sea to form the Tsushima Current, which flows north into the Sea of Japan (East Sea), while the main part of the current diverts eastward back out into the Pacific south of Kyushu and flows east of Japan....